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Question, what happens if you click on it? Do you get the option to click a specific version of the image, or are you automatically redirected to only one version?

Is it possible to have this userscript only group images if there’s over a certain amount of images to be grouped?
 
Like if there were 3 images from the same artist, it wouldn’t group, but if there were 4 or more images, it would group. Something like that.

The script has been updated for the new design, and I also got rid of jQuery in the process.  
The expand button has been moved into the meta bar above the thumbnail, but I might still change the design if it turns out to be too “hidden”. (I also have to update the screenshots in the OP later)

Seems the new site design has broken the functionality of this userscript.

@NostalgiaSchmaltz  
Your browser is forcing the script into strict mode (probably a security setting or something), which broke a part of the script which is only executed when there actually are images to be grouped. I fixed the script now so that it works in strict mode (and uses strict mode by default).

Also, FWIW, when I’m on a page that has no items to be grouped, it DOES show a number at the upper-left corner of each image frame, and Chrome’s debug console does not report any errors.
 
But when I go to a page that has more than 1 image from the same artist, the numbers stop showing and the Chrome debug console does give an error.

The debug window in Chrome is bringing up this error:
 

 
It does this regardless of DEBUG being set to true or false.
 
Here’s the full console output: http://i.imgur.com/IRdVTps.png

@NostalgiaSchmaltz  
I just tested it in Chrome and it still works for me. One thing you can try is enable the DEBUG option, open the console with Ctrl + Shift + J and then reload the page. Then paste the output here.

@Background Pony #FEAF  
I’m using Chrome.
 
Not sure why a newer version of Chrome would make a Tampermonkey script stop working.

@NostalgiaSchmaltz  
Most likely reason is that it doesn’t work with the newer version of whatever web browser your using.

It doesn’t seem to be working. I had this script before, and it did work, but after reinstalling it, it doesn’t seem to want to work, no matter what I set the thresholds to.

This is hot.

Introduction  
This userscript groups image thumbnails of similar images together to one thumbnail with a button to toggle all the other images in a group. For example, this is useful when multiple variants of the same image or similar images by the same artist are uploaded shortly in succession.  
Example: Without userscript  
 
With userscript  

 
Details  
Only images with the same artist(s) are grouped. The similarity is obviously calculated from the images’ tags, therefore it will be less accurate for images with few tags. Of course the amount of images per page doesn’t change, therefore you won’t any see more images than before. The benefit is that the page isn’t cluttered by multiple thumbnails of the same image.
 
You can configure several aspects of the script:  
Exclude images without artists: Don’t group images without artist. (Default: false)  
Tresholds: How similar the images should be to be grouped. If set to 0, all images by the same artist(s) are grouped. (Default: 0.7, 0.5, 0.5)  
Adjust for tagcount: Apply fancy mathematics to (hopefully) compensate for under- and overtagged images. (Default: true)  
Disable on artist tag pages: Don’t group images on /tags/artist:… pages. This is useful when you set the treshold to 0 to avoid grouping all images on that page. (Default: false)  
Weights: Different tags and tag namespaces can have different weights that they contribute to the similarity measure. These are set by default to group images with the same characters and filter out certain tags that would skew the calculation.  
Sorting: Set the sorting of images within a group. Options are: upload time (original order); score; and highest score first, then by similarity to the previous image (default)
 
Download  
You need Greasemonkey for Firefox or Tampermonkey for Chrome (or equivalent add-ons that can load userscripts).  
Download v0.5.1
 
Changelog  
0.5.1: “Temporary” fix for expand button taking up a new row  
0.5.0: Updated for Derpibooru’s new design, doesn’t use jQuery anymore  
0.4.1: Now works with JS strict mode  
0.4.0: First public release (see Gist for previous changes)
 
~Also check out my other userscripts: Tag suggestions, Images per page dropdown